A Novel Complex Gm-C IF Sub-Sampling Mixer

In this paper, a novel circuit referred to as complex G<sub>m</sub>-C sampler that can be used for sub-sampling IF signals is presented. The circuit employs a conventional cross-coupled G<sub>m</sub>-C filter structure with a built-in sampler to combine the functions of complex anti-alias filtering and baseband downconversion by sampling in a single circuit block. The filter response of the individual G<sub>m</sub>-C samplers can be tuned to a conventional lowpass response or a sinc type response depending on the circuit parameters thereby modifying the anti-alias filtering provided by the circuit. Input noise analysis and switch noise analysis of the complex G<sub>m</sub>-C sampler is also performed and the results are presented. The G<sub>m</sub>-C sampler and its complex version are designed using a 0.18 mum CMOS process and its operation are validated using Spectre RF. Simulation results of the designed complex G<sub>m</sub>-C sampler are finally provided.

Published in:
Proc. of the European Conference on Circuit Theory and Design (ECCTD), 29-32
Presented at:
European Conference on Circuit Theory Design, Antalya, TURKEY, Aug 23-27, 2009
Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa

 Record created 2010-06-24, last modified 2018-09-13

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